Well, at least you won't get moles. But seriously, I would definately try buying some but cheaper, that sounds expensive. Try to keep at least one area nice and damp for them and hopefully they will breed.
I can’t see the point in buying worms until you find out why you haven’t got any now, you could put new ones in and they may die like the previous ones. If you enrich your ground first with manure and compost, the worms will come naturally.
Gardening on the wild, windy west side of Dartmoor.
Get some manure and dig it in, then keep it damp with lots of precious water, that will get them going.
I have had a very dry couple of months on my allotment, not that I have been doing much digging, but there had been little sign of any worms,but we had very heavy rain for a few days, and when I was planting potatoes there were lots of the large type in the damp soil.
They are there but not showing themselves to me very often.
Earthworms will go deeper when the ground is dry. Here in East Northants we haven't had any rain of note since early March. It's quite possible you have a very shallow layer of topsoil as builders don't always return a building site to it's original condition as well as they should. I was a brickie and stripping away the topsoil is the primary aim to ensure a biologically inactive subsoil.
Lyn is right, add lots of manure to enrich what you do have. Then add worms if you like if they don't arrive of their own accord
@Lizzie27 usually reds or lobs at fishing shops I'm afraid saying that I use a mixture of mainly reds and dendras in my compost so that's what happens to any spares after fishing reds in the compost lobs on the garden and plenty's of manure.
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog
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If you enrich your ground first with manure and compost, the worms will come naturally.
Lyn is right, add lots of manure to enrich what you do have. Then add worms if you like if they don't arrive of their own accord
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog